Magnesium sulfate has been applied in various situations due to actual or potential benefits
related to neuroprotection, treatment of eclampsia/pre-eclampsia, arterial hypertension,
adrenergic reflex under laryngoscopy/intubation and, shivering, nausea and vomiting, among
others. In anesthesia it has been useful as an analgesic adjuvant; however, the method to
calculate the dose of magnesium sulfate in obese population is unclear. The objective of this
project is to compare two methods of dose calculation based either on the real weight or
corrected ideal weight.